are very efficient at part load conditions when high supply water temperatures
are not required; however, as always, there are unique items to consider when
designing around a condensing boiler:
Condensing boilers require both an outside air intake flue and an exhaust flue; therefore, space for these flues must be considered. This is very important when you have multiple boilers.
Condensate from each boiler must be treated (neutralized) prior to dumping into floor drains. Many boiler manufacturers now offer neutralizers as a built-in optional device. If so, spec this option.
Space must be considered; it is not uncommon to have many boilers side-by-side; thus, spacing of boilers and piping and flues, etc. becomes critical.
Service clearance areas must always be considered.
Each boiler’s gas load and gas pressure requirements must be coordinated with the plumbing engineer. In addition, vents from gas trains must be routed to outdoors.
Close coordination between boiler manufacturer’s recommended controls and the building’s BMS must occur.
It is important to coordinate the sequence of operation with flow diagrams.
Electrical engineer must be made aware of the boiler’s electrical requirements as well as providing emergency burner shut-off controls.
Pulse with modulation type condensing boilers have special noise and vibration concerns that must be addressed in the design. Carefully coordinate these types of requirements with the manufacturer’s sales representative.